What is the smallest power of 10 that would exceed 987654321098765432?

The smallest power of 10 that exceeds 987654321098765432 is (10^{18}). This is because (10^{18} = 1,000,000,000,000,000,000), which is greater than 987654321098765432, while (10^{17} = 100,000,000,000,000,00) is less than it. Therefore, (10^{18}) is the answer.